Regarding the issue of pipeline pressure testing
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Pressurize the pipeline with water; after pressurization is complete, release the pressure by opening the discharge at the bottom. If the vent at the top is not opened, will negative pressure be created? Isn’t there always positive pressure inside the pipeline? I would appreciate it if the experts here could explain it to me.
Negative pressure will be generated. People can’t stand it when they can only exhale but not inhale.
Negative pressure will be generated, and it is also difficult to drain all the water from the pipeline
Once the water pressure in the pipeline is released, negative pressure will be created.
If you turn a bottle filled with water upside down, and no gas enters through the opening, how can the water be drained? What would it be like if the bottom of the bottle were opened to allow air to pass through? ? That’s exactly the reason. Alas,,, a lack of observation and understanding regarding the imagination of nature.
Take a look at the answers from the experts upstairs – great!
Theoretically, there should be negative pressure, but in practice the pressure release is not necessarily at full flow, and air may enter
There is always a slight discrepancy between theory and practice